#pragma once

#include "noncopyable.hpp"
#include "InetAddress.hpp"
#include "Buffer.hpp"
#include "Callbacks.hpp"
#include "Timestamp.hpp"

#include <memory>
#include <string>
#include <atomic>

class EventLoop;
class Channel;
class Socket;

/**
 * TcpServer => Acceptor => 有一个新用户连接，通过accept函数拿到connfd
 * => TcpConnection 设置回调 => Channel => Poller => Channel的回调操作
 */
class TcpConnection : noncopyable, public std::enable_shared_from_this<TcpConnection>
{
public:
    TcpConnection(EventLoop *loop,
                const std::string &nameArg,
                int sockfd,
                const InetAddress& localAddr,
                const InetAddress& peerAddr);
    ~TcpConnection();
    
    EventLoop* getLoop() const { return loop_; }
    const std::string& name() const { return name_; }
    const InetAddress& localAddress() const { return localAddr_; }
    const InetAddress& peerAddress() const { return peerAddr_; }

    bool connected() const { return state_ == kConnected; }

    //发送数据
    void send(const std::string& buf);
    //关闭连接
    void shutdown();

    void setConnectionCallback(const ConnectionCallback& cb)
    { connectionCallback_=cb; }

    void setMessageCallback(const MessageCallback& cb)
    { messageCallback_=cb; }

    void setWriteCompleteCallback(const WriteCompleteCallback& cb)
    { writeCompleteCallback_=cb; }

    void setHighWaterMarkCallback(const HighWaterMarkCallback& cb,size_t highWaterMark)
    {
        highWaterMarkCallback_=cb;
        highWaterMark_=highWaterMark;
    }

    void setCloseCallback(const CloseCallback& cb)
    { closeCallback_=cb; }

    //连接建立
    void connectEstablished();
    //连接销毁
    void connectDestroyed();

private:
    enum StateE {kDisconnected,kConnecting,kConnected,kDisconnecting};

    void setState(StateE state) { state_=state; }

    void handleRead(Timestamp receiveTime);
    void handleWrite();
    void handleClose();
    void handleError();

    void sendInLoop(const void* data,size_t len);
    void shutdownInLoop();

    EventLoop *loop_; //这里绝对不是baseLoop，因为TcpConnection都是在subLoop里面管理的
    const std::string name_;
    std::atomic_int state_;
    bool reading_;

    //这里和Acceptor类似 Acceptor => mainLoop(listenfd)  TcpConnection => subLoop(connfd)
    std::unique_ptr<Socket> socket_;
    std::unique_ptr<Channel> channel_;

    const InetAddress localAddr_;
    const InetAddress peerAddr_;

    ConnectionCallback connectionCallback_; //有新连接时的回调
    MessageCallback messageCallback_; //有读写消息时的回调
    WriteCompleteCallback writeCompleteCallback_; //消息发送完成以后的回调
    HighWaterMarkCallback highWaterMarkCallback_;
    CloseCallback closeCallback_;

    size_t highWaterMark_;

    Buffer inputBuffer_; //接受数据的缓冲区
    Buffer outputBuffer_; //发送数据的缓冲区
};